That moment when you're about to explain something to someone you don't know very well and your brain is trying to figure out where to start so it isn't too technical to come off as patronizing and confusing or too non-technical to come off as insulting or belittling.
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I met a guy I knew from G+ for coffee offline. He's literally a rocket scientist. I could *see* him working out how far down he had to come to speak with me. 😂